WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/src/drivers/i8259.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup ia32   
 * @{
 */
/**
 * @file
 * @brief PIC driver.
 *
 * Programmable Interrupt Controller for UP systems based on i8259 chip.
 */
 
#include <arch/drivers/i8259.h>
#include <cpu.h>
#include <arch/types.h>
#include <arch/asm.h>
#include <arch.h>
#include <print.h>
#include <interrupt.h>
 
 
 
 
 
 
static void pic_spurious(int n, istate_t *istate);
 
void i8259_init(void)
{
    /* ICW1: this is ICW1, ICW4 to follow */
    outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
 
    /* ICW2: IRQ 0 maps to INT IRQBASE */
    outb(PIC_PIC0PORT2, IVT_IRQBASE);
 
    /* ICW3: pic1 using IRQ IRQ_PIC1 */
    outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
 
    /* ICW4: i8086 mode */
    outb(PIC_PIC0PORT2, 1);
 
    /* ICW1: ICW1, ICW4 to follow */
    outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
 
    /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
    outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
 
    /* ICW3: pic1 is known as IRQ_PIC1 */
    outb(PIC_PIC1PORT2, IRQ_PIC1);
 
    /* ICW4: i8086 mode */
    outb(PIC_PIC1PORT2, 1);
 
    /*
     * Register interrupt handler for the PIC spurious interrupt.
     */
    exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious);
 
    /*
     * Set the enable/disable IRQs handlers.
     * Set the End-of-Interrupt handler.
     */
    enable_irqs_function = pic_enable_irqs;
    disable_irqs_function = pic_disable_irqs;
    eoi_function = pic_eoi;
 
    pic_disable_irqs(0xffff);       /* disable all irq's */
    pic_enable_irqs(1<<IRQ_PIC1);       /* but enable pic1 */
}
 
void pic_enable_irqs(__u16 irqmask)
{
    __u8 x;
 
    if (irqmask & 0xff) {
        x = inb(PIC_PIC0PORT2);
        outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
    }
    if (irqmask >> 8) {
        x = inb(PIC_PIC1PORT2);
        outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
    }
}
 
void pic_disable_irqs(__u16 irqmask)
{
    __u8 x;
 
    if (irqmask & 0xff) {
        x = inb(PIC_PIC0PORT2);
        outb(PIC_PIC0PORT2, x | (irqmask & 0xff));
    }
    if (irqmask >> 8) {
        x = inb(PIC_PIC1PORT2);
        outb(PIC_PIC1PORT2, x | (irqmask >> 8));
    }
}
 
void pic_eoi(void)
{
    outb(0x20,0x20);
    outb(0xa0,0x20);
}
 
void pic_spurious(int n, istate_t *istate)
{
#ifdef CONFIG_DEBUG
    printf("cpu%d: PIC spurious interrupt\n", CPU->id);
#endif
}
 
/** @}
 */
 
 

Rev 1702	Rev 1754
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup ia32	29	/** @addtogroup ia32
30	* @{	30	* @{
31	*/	31	*/
-		32	/**
32	/** @file	33	* @file
-		34	* @brief PIC driver.
-		35	*
-		36	* Programmable Interrupt Controller for UP systems based on i8259 chip.
33	*/	37	*/
34		38
35	#include <arch/drivers/i8259.h>	39	#include <arch/drivers/i8259.h>
36	#include <cpu.h>	40	#include <cpu.h>
37	#include <arch/types.h>	41	#include <arch/types.h>
38	#include <arch/asm.h>	42	#include <arch/asm.h>
39	#include <arch.h>	43	#include <arch.h>
40	#include <print.h>	44	#include <print.h>
41	#include <interrupt.h>	45	#include <interrupt.h>
42		46
43	/*	-
44	* This is the PIC driver.	-
45	* Programmable Interrupt Controller for UP systems.	-
46	*/	-
47		-
48	static void pic_spurious(int n, istate_t *istate);	47	static void pic_spurious(int n, istate_t *istate);
49		48
50	void i8259_init(void)	49	void i8259_init(void)
51	{	50	{
52	/* ICW1: this is ICW1, ICW4 to follow */	51	/* ICW1: this is ICW1, ICW4 to follow */
53	outb(PIC_PIC0PORT1, PIC_ICW1 \| PIC_NEEDICW4);	52	outb(PIC_PIC0PORT1, PIC_ICW1 \| PIC_NEEDICW4);
54		53
55	/* ICW2: IRQ 0 maps to INT IRQBASE */	54	/* ICW2: IRQ 0 maps to INT IRQBASE */
56	outb(PIC_PIC0PORT2, IVT_IRQBASE);	55	outb(PIC_PIC0PORT2, IVT_IRQBASE);
57		56
58	/* ICW3: pic1 using IRQ IRQ_PIC1 */	57	/* ICW3: pic1 using IRQ IRQ_PIC1 */
59	outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);	58	outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
60		59
61	/* ICW4: i8086 mode */	60	/* ICW4: i8086 mode */
62	outb(PIC_PIC0PORT2, 1);	61	outb(PIC_PIC0PORT2, 1);
63		62
64	/* ICW1: ICW1, ICW4 to follow */	63	/* ICW1: ICW1, ICW4 to follow */
65	outb(PIC_PIC1PORT1, PIC_ICW1 \| PIC_NEEDICW4);	64	outb(PIC_PIC1PORT1, PIC_ICW1 \| PIC_NEEDICW4);
66		65
67	/* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */	66	/* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
68	outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);	67	outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
69		68
70	/* ICW3: pic1 is known as IRQ_PIC1 */	69	/* ICW3: pic1 is known as IRQ_PIC1 */
71	outb(PIC_PIC1PORT2, IRQ_PIC1);	70	outb(PIC_PIC1PORT2, IRQ_PIC1);
72		71
73	/* ICW4: i8086 mode */	72	/* ICW4: i8086 mode */
74	outb(PIC_PIC1PORT2, 1);	73	outb(PIC_PIC1PORT2, 1);
75		74
76	/*	75	/*
77	* Register interrupt handler for the PIC spurious interrupt.	76	* Register interrupt handler for the PIC spurious interrupt.
78	*/	77	*/
79	exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious);	78	exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious);
80		79
81	/*	80	/*
82	* Set the enable/disable IRQs handlers.	81	* Set the enable/disable IRQs handlers.
83	* Set the End-of-Interrupt handler.	82	* Set the End-of-Interrupt handler.
84	*/	83	*/
85	enable_irqs_function = pic_enable_irqs;	84	enable_irqs_function = pic_enable_irqs;
86	disable_irqs_function = pic_disable_irqs;	85	disable_irqs_function = pic_disable_irqs;
87	eoi_function = pic_eoi;	86	eoi_function = pic_eoi;
88		87
89	pic_disable_irqs(0xffff); /* disable all irq's */	88	pic_disable_irqs(0xffff); /* disable all irq's */
90	pic_enable_irqs(1<<IRQ_PIC1); /* but enable pic1 */	89	pic_enable_irqs(1<<IRQ_PIC1); /* but enable pic1 */
91	}	90	}
92		91
93	void pic_enable_irqs(__u16 irqmask)	92	void pic_enable_irqs(__u16 irqmask)
94	{	93	{
95	__u8 x;	94	__u8 x;
96		95
97	if (irqmask & 0xff) {	96	if (irqmask & 0xff) {
98	x = inb(PIC_PIC0PORT2);	97	x = inb(PIC_PIC0PORT2);
99	outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));	98	outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
100	}	99	}
101	if (irqmask >> 8) {	100	if (irqmask >> 8) {
102	x = inb(PIC_PIC1PORT2);	101	x = inb(PIC_PIC1PORT2);
103	outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));	102	outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
104	}	103	}
105	}	104	}
106		105
107	void pic_disable_irqs(__u16 irqmask)	106	void pic_disable_irqs(__u16 irqmask)
108	{	107	{
109	__u8 x;	108	__u8 x;
110		109
111	if (irqmask & 0xff) {	110	if (irqmask & 0xff) {
112	x = inb(PIC_PIC0PORT2);	111	x = inb(PIC_PIC0PORT2);
113	outb(PIC_PIC0PORT2, x \| (irqmask & 0xff));	112	outb(PIC_PIC0PORT2, x \| (irqmask & 0xff));
114	}	113	}
115	if (irqmask >> 8) {	114	if (irqmask >> 8) {
116	x = inb(PIC_PIC1PORT2);	115	x = inb(PIC_PIC1PORT2);
117	outb(PIC_PIC1PORT2, x \| (irqmask >> 8));	116	outb(PIC_PIC1PORT2, x \| (irqmask >> 8));
118	}	117	}
119	}	118	}
120		119
121	void pic_eoi(void)	120	void pic_eoi(void)
122	{	121	{
123	outb(0x20,0x20);	122	outb(0x20,0x20);
124	outb(0xa0,0x20);	123	outb(0xa0,0x20);
125	}	124	}
126		125
127	void pic_spurious(int n, istate_t *istate)	126	void pic_spurious(int n, istate_t *istate)
128	{	127	{
129	#ifdef CONFIG_DEBUG	128	#ifdef CONFIG_DEBUG
130	printf("cpu%d: PIC spurious interrupt\n", CPU->id);	129	printf("cpu%d: PIC spurious interrupt\n", CPU->id);
131	#endif	130	#endif
132	}	131	}
133		132
134	/** @}	133	/** @}
135	*/	134	*/
136		-
137		135

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/drivers/i8259.c – Rev 1702 → 1754